单项选择题

All flights ______ because of the snowstorm, we decided to take the train.

A. were canceled
B. had been canceled
C. having canceled
D. having been canceled
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单项选择题
The policemen went into action______when they heard the alarm.
A. promptly
B. presently
C. quickly
D. directly
单项选择题
Most electronic devices of this kind, ______ manufactured for such purposes, are tightly packed.
A. that are
B. as are
C. which is
D. it is
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